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• ffmpeg with "-pattern_type glob" and variable in bash script

  20 juin 2019, par KlausPeter

  I’m trying to let ffmpeg make a video of all pictures in a directory using the -pattern_type glob switch and "/foo/bar/*.jpg". This works well, if I execute the command manually für just one directory. For example :

  ffmpeg -framerate 35 -pattern_type glob -i '/root/webcam_test/2018-07-21/*.jpg' -vf scale=1280:-1 -c -c:v libx264 -pix_fmt yuv420p /root/clips/out01_cut.mp4

  However, if I do it in a bash script and set the path via a variable, according to ffmpegs output, the variable gets substituted correctly, but ffmpeg states that

  ’/root/webcam_test/2018-07-21/*.jpg’ : No such file or directory

  The part of the script looks like this :

  for D in `find /root/webcam_test/ -type d`
  
  do
  
      [...]
  
      cmd="ffmpeg -framerate 35 -pattern_type glob -i '$D/*.jpg' -vf scale=1280:-1 -c -c:v libx264 -pix_fm                                 t yuv420p /root/clips/$d_cut.mp4"
  
      echo $cmd
  
  [...]
  
  done

  Does anyone know how to make ffmpeg do its wildcard interpretation even if the path is constructed by a script and not just try to plainly use the given path ?
  Best regards and thanks in advance

• While loop in bash to read a file skips first 2 characters of THIRD Line

  9 juillet 2018, par Yaser Sakkaf

  #bin/bash
  
  INPUT_DIR="$1"
  
  INPUT_VIDEO="$2"
  
  OUTPUT_PATH="$3"
  
  SOURCE="$4"
  
  DATE="$5"
  
  
  
  INPUT="$INPUT_DIR/sorted_result.txt"
  
  COUNT=1
  
  initial=00:00:00
  
  while IFS= read -r line; do
  
    OUT_DIR=$OUTPUT_PATH/$COUNT
  
    mkdir "$OUT_DIR"
  
    ffmpeg -nostdin -i $INPUT_VIDEO -vcodec h264 -vf fps=25 -ss $initial -to $line $OUT_DIR/$COUNT.avi
  
    ffmpeg -i $OUT_DIR/$COUNT.avi -acodec pcm_s16le -ar 16000 -ac 1 $OUT_DIR/$COUNT.wav
  
    python3.6 /home/Video_Audio_Chunks_1.py $OUT_DIR/$COUNT.wav
  
    python /home/transcribe.py  --decoder beam --cuda --source $SOURCE --date $DATE --video $OUT_DIR/$COUNT.avi --out_dir "$OUT_DIR"
  
    COUNT=$((COUNT + 1))
  
    echo "--------------------------------------------------"
  
    echo $initial
  
    echo $line
  
    echo "--------------------------------------------------"
  
    initial=$line
  
  done < "$INPUT"

  This is the code I am working on.
  The contents of file sorted_results.txt are as follows :

  00:6:59
  
  00:7:55
  
  00:8:39
  
  00:19:17
  
  00:27:48
  
  00:43:27

  While reading the file it skips first two characters of the third line i.e. it takes it as :8:39 which results in the ffmpeg error and the script stops.

  However when I only print the variables $INITIAL and $LINE, commenting the ffmpeg command the values are printed correctly i.e. same as the file contents.

  I think the ffmpeg command is somehow affecting the file reading process or the variable value. BUT I CAN’T UNDERSTAND HOW ?

  PLEASE HELP.

• ffmpeg select subclips from large video bash and create outputfile names

  29 juin 2018, par martins

  I am using bash command on a Mac Terminal. For each of the 250 .mp4 files in a directory I need to create a new outputfile which extracts 4 subclips from each inputfile : 1st subclip (from second 10 to 20), 2nd subclip (10 seconds at a 33% stage of the inputfile), 3rd subclip (10 seconds at a 66% of the inputfile), and a 4th subclip (10 seconds starting 30seconds before the end of the inputfile). Each inputfile has a different length of about 10-15minutes.

  I tried with one inputfile and the following bash script works :

  #!/bin/bash
  
  for file in *.mp4; do ffmpeg -i "$file" -vf "select='between(t, 10, 20) + between(t, 197, 207) + between(t, 393, 403) + between(t, 570,580)',
  
  setpts=N/FRAME_RATE/TB" -qscale 0 -af "aselect='between(t, 10, 20) + 
  
  between(t, 197, 207) + between(t, 393, 403) + between(t, 570, 580)', 
  
  asetpts=N/SR/TB" outputfile.mp4; done

  However, I don’t know how to loop it over the 250 mp4 files. Specifically, I have 2 issues :

  1. The above code shows specific seconds I manually checked from the inputfile I used to test the code. I need to automatize the code according to the timings above.
  2. Name the outputfile the same as the inputfile but adding "_1" suffix

  In sum, I have a directory with inputfiles between 10-15minutes long :

  inputfile1.mp4
  
  inputfile2.mp4
  
  inputfile3.mp4
  
  .......
  
  inputfile250.mp4

  And I want the same directory with inputfiles and outputfiles together :

  inputfile1.mp4
  
  inputfile1_1.mp4 #this is 40 seconds long
  
  inputfile2.mp4
  
  inputfile2_1.mp4 #this is 40 seconds long
  
  inputfile3.mp4
  
  inputfile3_1.mp4 #this is 40 seconds long
  
  .......
  
  inputfile250.mp4
  
  inputfile250_1.mp4 #this is 40 seconds long

  Thank you very much in advance.